We changed the leaky head gasket, water pump(which the fins were worn down to nothing) & thermostat. Still no heat. Hose going into heatercore is same temp as one coming out. Without replacing it is there a way to blast that thing out with something other than water? Whoever worked on it before put that Barrs Leaks in it. It's gotta be glued up bigtime in there. Thanks.

Would think with the same water temp on each hose would indicate water flow through it. Disconnect both hoses at engine and using a garden hose flush out the core one way and then go in reverse. If water flows through it, your no heat problem is else where (blend door). The blend door directs the air flow across the core for heat and bypasses it for no heat. In these later models water flows through the heater core at all times, there is no water control valve as was used years ago.

It was the metal shavings from the inside propellers that had eroded away from that orange anti-freeze. The metal shavings had gotten clogged in the bend(curve) in the metal line right before the heater core. Our dude put 20 lbs of pressure through the engine & put some chemical in it, flushed the hell out of it & even showed me about 3/4 of a cup of shavings that had been clogging it. Now you can't even wear a coat inside. Thanx again to all who had suggestions. Now I'm trying to get my old squeaky serpentine pulley off. I can get my 5/8 socket on it okay, but won't crack loose for the life of me. Does that bolt come off in reverse of regular loosening? (turn wrench to the right? i.e...rightey loosey, lefty tighty???

On my Dakota, I unhooked both hoses leading to the core at the local car wash. Shoved the end of the high pressure wand up into the hose as far as it would go and blasted it out from both directions multiple times. Flushed mostly rust out of the system.
The heat worked fine after that.